The "cat" command is mostly used for viewing files but not many people know that the original purpose of this command is for merging files together ("cat" is the abbreviation of "catenate", which means " to connect things together").

The syntax to use "cat" to merge multiple files is very simple. Suppose you have a sample file1 like this:

11111
11111

And a sample file2 like this:

22222
22222

And a sample file3 like this:

33333
33333

To merge the three sample files above into a new file4, the command you can use will be: